Leases - Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 46	$ 52
Accrued liabilities	16	16
Operating lease liabilities	36	43
Operating lease liabilities	52	59
Operating Lease, Right-of-Use Asset, in Exchange for Lease Obligations	$ 14	$ 14
Operating Lease, Weighted Average Remaining Lease Term	5 years	5 years
Weighted average discount rate	5.00%	5.00%